CMD-S does now work for Macs. Thanks.
There is another bug I have found. The plugin works as expected for new posts, pages, links as well as editing existing pages and links. But when editing existing posts, it does not have the expected behavior.
Also – but of much less importance – when adding user profiles, link categories, and editing existing posts, media, link categories, comments, theme files, plugin files, user profiles, and settings it does not cause changes to be saved.
Saving posts and pages was my core frustration, and that is now cured (almost).
Thanks for your work.